21500740575 has 48 divisors (see below), whose sum is σ = 41576505600. Its totient is φ = 10863525600.

The previous prime is 21500740559. The next prime is 21500740601. The reversal of 21500740575 is 57504700512.

21500740575 is a `hidden beast` number, since 2 + 15 + 0 + 0 + 74 + 0 + 575 = 666.

It is not a de Polignac number, because 21500740575 - 2⁴ = 21500740559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 825411 + ... + 851060.

It is an arithmetic number, because the mean of its divisors is an integer number (866177200).

Almost surely, 2^21500740575 is an apocalyptic number.

21500740575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21500740575 is a deficient number, since it is larger than the sum of its proper divisors (20075765025).

21500740575 is a wasteful number, since it uses less digits than its factorization.

21500740575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676509 (or 1676498 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The spelling of 21500740575 in words is "twenty-one billion, five hundred million, seven hundred forty thousand, five hundred seventy-five".